.shuttle-box-left {float: left;width: calc((100% - 72px) / 2);height: 100%;}
.shuttle-box-center {float:left;width: 72px;height: 100%;}
.shuttle-box-center > div{padding: 5px;}
.shuttle-box-right {float:left;width: calc((100% - 72px)/2);height: 100%;}